Friction brake



sept. 9, 1924. l 1,508,068

- W. W. ROACH FRICTION BRAKE Filed Nov. l, 1922 i 4 Sheets-Shea?l l l Y* gnou/doc Wllam WRoacb,

Sept. 9, 1924. 1,508,068

W. W. ROACH FRICTION BRAKE Filed Nov. l. 1922 4 sheets-sheet 2 GHG: new

W. W. ROACH FRICTION BRAKE Sept. 9 1924.

Filed Nov. l, 1922 4 Sheets-Sheet 5 wuenfoz illam WROac la,

atroz n v Sept. 9, 1924. 1,508,068

W. w. ROACH 1 FRICTION BRAKE Filed Nov. l, 1922 4 Sheets-Sheet 4 gnou/Hoz )William Wloack,

Patented Sept. 9, 1924.

UNITED STATES PATENTGFFICE.

WILLIAM W. ROACH, O' PHILADELPHIA, PENNSYLVANIA.

FRICTION BRAKE.

Application led November l, 1922. Serial No. 598,278.

-To all wlw/m. t may con/cem:

of the disk type and is especially adapted and intended for use upon automobiles. It is in the nature of an improvement upon the brakes of my prior Patents No. 1,278,081, of Sept. 3, 1918, and Reissue No. 14,426, of January 22, 1918.

As in the brakes of the said patents, I make use of friction disks instead of bands or shoes, and the brake as a whole is independent of the wheel, or other part to be braked, except for the necessary connections for rotating one portion of the brake 'with the wheel, so that the brake can operate even if the wheel is olf; that is to say, if one wheel is removed, the'action of the brake on the other wheel remains the same, whichA is not the case with the ordinary band or shoe brake.

The improvements will be readily understood from the following description read in connection with the accompanying drawings, in which,

Figure 1 is a side elevation of the brake ap lied to a wheel;

igure 2 is a section on line 2 2 of Figure 1;

Figure 3 is a section on line 3--3 of Fig ure 1;

Figure 4 is a section on line 4-4 of Figure 3;

Figure 5 is a section through the brake applied to a disk wheel;

Figure 6 is an elevation of the brake applied to the propeller shaft of an automobile;

Figure 7 is a side elevation of a brake-actuating means, and

Figure 8 is a plan view of the same.

In Figures 1 to 4, an automobile wheel is partially shown at 1. to the hub 2 of which is secured, as by bolts 4, the brake casing member 3. 5 represents the end ofthe fixed axle and 6 the driving shaft passing therethrough. Secured to said axle, by means of the collar 8, is the plate 7, which constitutes the other, non-rotary part of the casing for the brake and has a ange 9, fitting over the flange 10 of the rotary casing part 3. and, on

its inner side, a friction surface 11. The plate 7 carries the studs 12, projecting inwardly into the casing and shown as three in number. These studs pass through holes in the friction disk 13, the center of which is cut away, as indicated at 14. Between the friction surface 11 of the plate 7 and that of the disk 13, is interposed the rotary ring 15, /to which rings 16 of friction material, for

example asbestos, are securedV on each side. i

Said ring 15 has three external lugs 17, through which pass the studs 18 carried by the casmg part 3, so that said friction ring l5, 16, rotates with the wheel, while the plate 7 fand disk 13 are `held against rotation by their connection to the fixed axle 5. The dlsk 13 ca`n slide on the studs 12 towards the plate 7, and the ring 15 can slide on the studs 18, so that said ring is gripped between said disk and plate. The asbestos rings 16 may be secured to the ring 15 by means of the rivets 20.

The means I prefer to employ for operating the brake, that is for pulling the disk 13 towards the plate 7, consists of an annular member 21 which is pivoted lon` the in 22, carried by the stud 23, secured in't e plate 7 The opposite side of said annular member has. an opening through which passes loosely the headed stud 24, said stud also passing freely through a hole in the plate 7 and carrying a nut 25 on its outer end. The annular member 21 is 0peratively connected to the disk 13 by means of two diametrically ,opposite anges 26, secured to sad member :lilround its entrall opening an enga g t e inner e e o said disk. Securedgltld the outer side gf the plate 7 is a cam sleeve 27, provided with saw teeth 28 on its end and through which the bolt 24 passes, and a conjugate cam sleeve 29, havin an operating arm 30, is rotatively carrie by said bolt between the nut 25 and the fixed cam sleeve 27. By turning said nut the position of the plate 13 lcan be adjusted, and consequently the sensitiveness of the brake. A spring 31 is, or ma be, interposed between the surface 11 and the annular actuating member 21 to return the parts to inoperative position. By the provision of the intermediate member 21 between the actuating stud 24 and the disk 13, said disk is moved parallel to itself and exerts e ual pressure on both sides of its center, w 'ch would not be the case if Sii stud were connected directly to said ln Figure 5 ll have Shown the casing for the brake as formed in the dished portion 32 of a disk or solid web wheel 33. ln this case the plate 7. does not have any flange 9 but is bevelled to t against said web and thereby close the recess. llhe brake is otherwise as above described. ln Fig. 6 ll illustrate the application of the brake to the propeller shaft instead of to the wheel of an automobile. The casing, consisting of the parte 7 and 3, with flanges 9 and l0, has one of its members secured to a stationary part 34 of the chassis, or oi the transmission, while the other part is secured to the casing 35 oi 'the universal joint.4 ln this case the arm 30 is connected by alink 36 to a bell crank lever 3'? actuated by the brake rod 38, whereas in the case where'the brake is applied to the wheel, the brake rod 38 is connected directly to the arm 30, as indicated in Fig. l.

inasmuch as my improved brake is much more power-lul than the ordinary band brake, it is not necessary to have separate hand and `loot brakes, as now generally provided. 'l provide for the operation of the brake either by hand or foot, however, as shown in lligs. 7 and 8, in which 4() is the foot pedal, connected by rod 41 to the arm 42 on the cross shaft 43, which carries arms 44 connected to tliebrake arms 30 by the rods 38, and 45 is the hand lever, provided with the usual locking latch 46 and segment 47 and connected tov the arm 48 on the shaft 43 by rthe rod 49, which has a slot 50 in its enlarged end 5l, so that the brake can be applied by .the pedal without aecting the handlever 45. The fact that the pedal is depressed when the brake is applied hy the hand lever is immaterial. @liviously minor variations in detail from the precise construction shown may be made without aili'ectiiig the invention.

@ne of the advantages oin this brake is that it is quite independent of the wheel. l/Vlien a wheel is taken oiri, the only part removed with it is the `casing1 member 3 and. o'i course, the studs i8 which connect said member to the ring l5.- liz the pedal or hand lever is now actuated, the ringis gripped between the plates 'i3 and 7 and brake on the other wheel is applied eiractly as if both Wheels were on. To adjust the it is onlyY necessary to turn the nut By removal oi the wheel, the brake is *fully exposed for inspection.

'i aving thus described the what is claimed is:

l. .A i'riction brake -for automobiles, cominvention prising' a lined plate, a friction ring con axially relatively to said plate, and means to draw said disk towards said plate to grip said ring between them, said means comprising a bolt operatively connected to said disk and passing' within said ring" and F through said plate, a cam sleeve rotatable on said bolt, a conjugate cam sleeve secured to said plate, and mea-ns to turn said rotatable sleeve. K

2. A rfriction brake Jfor automobiles, comprising a fixed plate constituting part of casing for the brake and having a `l'rietion surface on its inner side, a friction within the casing axially movable into contact with said surface and operatively connected to the rotary part tobe braked, a non-rotary 'friction disk on the other side of said ring; axially movable into contact with said ring, a saw tooth cam sleeve secured to the outer side of said plate, a bolt passingP through said sleeve and connected to said disk, a coniugate cam member on said bolt, means to turn said member, means to adjust the effective length of bolt.

3. lin an automobile brake, the combina tion of a tired braking disk, an axially movable non-rotary braking disk, a rotaiv friction ring intermediate said disks` means engaging said movable disk at two diametrically opposite points to force it towards said fixed disk to grip said ringsv between said disks, and relatively rotatable cam sleeves to actuate said means.

4. A friction brake tor automobiles comprisine a fixed brakingn disk. an axially movable non-rotatable braking disk, an intermediate axially movable rotary friction ring:` and means to move said movable disk axially so as to grip said ring1 between said disks. said means comprising an annular member pivoted at one side to said lined disk. diametrically opposite flanges carried by said movable disk and eneaainathe inner edge of said member. a bolt loosely secured to the other side oi said member and passing within said iirictioi'i ringa through said lined disk. a hired cani sleeve on the outer liace ot saidv hired disk and through which said bolt passes. a rotatable coniugate cam sleeve on said bolt. and means to turn said rotatable sleeve. p

A 'friction brake for automobiles coinprising a pair oir3 non-rotatable friction disks. an ,intermediate axially maval rotary friction rino, and means to move one oi said disks atrially so as to 'grip said i between saiddisks. said means compi an annular member pivoted at one side the other disk, diametrically opno flanges carried by the axially move! disk and engaging the inner adire of sa member. a bolt loosely secured to the ein side ot said member and passinga within Ofi" lll@

lili' the axial position of said movable disk, and.

a spring to return said movable disk to non-braking position.

6. A friction brake for solid web wheels, comprising a plate carried by the Iixed axle in position to close a dished recess in the web of the wheel, and having a friction surface on its inner side, a friction disk within said recess, studs carried by said plate and passing through. holesk in said disk, means on the outer side of said plate and connected to said disk to slide the latter 4on said studs, and a friction ring,

movable axially but connected to rotate with the wheel, intermediate said disk and plate.

7. An automobile brake, comprising a casing member secured to the wheel and carrylng inwardly projecting studs, a complementary casing member secured to the fixed axle and also carrying inwardly projecting studs, an annular friction disk slidably mounted on said last mentioned studs, an intermedia-te friction ring slidably mounted on said first mentioned studs, and

means on the outside of said complementary casing member to draw said friction disk towards the same to grip said friction ring between them. l

In testimony whereof I have hereunto set my hand.

WILLIAM W. ROAOH. 

